From what I have searched I cannot find any bad press about this supplier. No complaints or listings on any scam sites.
Here is some more information that might help.
Registrant:
US Car Audio Inc
7616 Foothill Blvd
Tujunga, California 91042
United States
Registered through: GoDaddy.com, Inc. (Link hidden: Login to view)
Domain Name: INFINITECARAUDIO.COM
Created on: 12-Aug-02
Expires on: 12-Aug-09
Last Updated on: 09-Mar-06
Administrative Contact:
, sales@uscaraudio.com
US Car Audio Inc
7616 Foothill Blvd Suite B
Tujunga, California 91042
United States
818-335-4743